This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 11 |
| 5 | 19 |
| 6 | 90 |
| 7 | 153 |
| 8 | 712 |
| 9 | 1208 |
| 10 | 5609 |
| 11 | 9514 |
| 12 | 44163 |
| 13 | 74907 |
| 14 | 347698 |
| 15 | 589745 |
| 16 | 2737424 |
| 17 | 4643056 |
| 18 | 21551697 |
| 19 | 36554706 |
| 20 | 169676155 |
| 21 | 287794595 |
| 22 | 1335857546 |
| 23 | 2265802057 |
| 24 | 10517184216 |
| 25 | 17838621864 |
| 26 | 82801616185 |
| 27 | 140443172858 |
| 28 | 651895745267 |